Instructions
In a small bowl, whisk together 4 tablespoons of the olive oil, the lemon zest, parsley, shallots, and lemon juice to make a relish. Season to taste with salt and pepper.

Remove the muscle from the side of each scallop and discard.

In a large skillet over medium high heat, warm the remaining 2 tablespoons olive oil. Add the scallops in a single layer. Do not overcrowd the pan.

Cook the scallops until golden on 1 side, about 2 minutes. Turn the scallops, season with salt and pepper, and continue to cook until the scallops are golden and slightly firm to the touch, 2 to 3 minutes.

To serve, divide the scallops among 6 serving plates. Spoon the relish over the scallops, distributing evenly. Top with the watercress, garnish with lemon wedges, and serve immediately.